Differential pressure indicator



FIG. 1 is a top, front and right side perspective view of a differentialpressure indicator showing our new design;

FIG. 2 is a bottom, rear and left side perspective view;

FIG. 3 is a top plan view;

FIG. 4 is a right side elevational view, the left side elevational viewbeing identical;

FIG. 5 is a typical end elevational view; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for a differential pressure indicator, as shownand described.